FAULT DIAGNOSIS IN NETWORKS

An apparatus and corresponding method for determining a cause of a fault in a network. The apparatus comprises a means for receiving, which may be a receiver, configured to receive a plurality of time separated samples of a primary network metric that are indicative of a fault in the network, and a plurality of time separated samples of one or more indicator network metrics. The apparatus comprises a means for correlating, which may be a correlator, configured to determine one or more metric correlation values relating to dependences between the samples of the primary network metric and the samples of each of the one or more indicator network metrics. The correlator is further configured to determine one or more fault correlation values relating to dependences between the one or more metric correlation values and a plurality of stored metric correlation values associated with a fault cause. The apparatus comprises a means for fault determining, which may be a fault determiner, configured to determine a cause of the fault based on the one or more fault correlation values.